I'm closing this as WONTFIX for the following reasons:
- this option seems to depend on the combination of video card and monitor,
some combinations need it, others work just fine without.
- Many other distributions use our MonitorsDB and changing the format will most
likely break their (and our) tools that use it.
- MonitorsDB will most likely become obsolete in the near future.

In defense of the proposal; reduced blanking is a perfectly clearly defined VESA
standard feature of the monitor alone. It may be supported / used only by
certain video cards but it's an actual feature of the video signal that you are
allowed to feed the monitor (e.g. LCD monitors can have reduced blanking since
they have circuitry writing to individual pixels, CRT can't since they need time
for the beam to fly back to the left of screen).
What's the new / proposed alternative for MonitorsDB; where can we find it?